edit: Woops. Didn't see you there, Thorpe. Sorry!
You could check to see if you installed PHP correctly by creating a simple document and title it: "info.php" and write this code in it:
<?php
// Show all information
phpinfo();
?>
Or, another quick check is to create a php file called "hello.php" and write this code in it:
<?php
// echo statement
echo "HELLO WORLD! I am writing this with PHP!! I rock!!!";
?>
Save one or the other, and load it in your browser. If it displays, you are on your way...
You don't HAVE to use dreamweaver, but it IS a powerful tool in CODE view so you can write PHP code alongside your HTML...